XRAY - Model racing cars

Hey All,
Just wondering if anyone else has encountered this problem. Upon assembling the 808 active diff it binds making the diff action quite stiff. I have assembled many Xray diffs as well as the XT8 active diff with no issues. I have also ensured the diff gears are seated appropriately. Any suggestions?
Thanks,
Kane

The active diff is going to feel alittle stiffer then a std. diff. I would just take it apart to make sure everything is ok and it should be fine. I thought the same thing on mine when I first built it.

I noticed when I built mine for the first time, the tolerances of the internal gears and rings were very tight. Just make sure everything is properly seated and in place and nothing is binding. Try building it without any diff fluid, this way its not messy if you need to double check any binding issues. Then fill it once your sure..

And make sure its properly shimmed to the pinion in the diff case. Most likely you'll have to shim(s) it closer to the pinion.

Thanks for the input, it was beyond a little stiff which was caused by the crown gear side being too tight against the other gears. I put two diff gaskets on the one side and it is as smooth as silk now.
Thanks,
Kane

I had the same problem with one of my active diffs, It was fine when the two parts where seperate but when you bolted them together it would bind up, I found that it was the diff pin part No 355189 would not locate in the spur gear collar part No 355195, it would just stop the collar from sitting flat against the washer part No 964060, All i did to fix it was just dremel away the edges to the notch in the collar so the pin dropped straight in.
Hope that helps.
Sean.

I also ran into this problem. Once I figured it out its ok, but at first it was very tough. I hope with some use it'll be easier to take this diff apart. I regrease my outdrive regularly and thats going to be tough with this diff.

When you build them, if they lock up real bad, thats because the side gear and the bevel ring are binding up and not installed down all the way. The guts are stuck apart and too thick, and the diff locks up as the screws are tightened.

Even worse is that after tightening those screws, and realizing it, it's too late. The pressure from the screws pressed the side gear and crooked bevel ring together and they are siezed and you will not be able to remove them to fix the problem.

A way to be sure that that is the problem. Remove the 4 spider gears and cross pins. Put the diff together with very little fluid and no spidergears or cross pins. Is it still bound up?

If it is, the easy solution to knock the side gear and bevel ring together is to set the diff outdrive down ,without the spiders and cross pins installed, on top of a block of steel or vice. Tap the on the other outdrive gently with a 14once steell ball peen hammer. That should reseat the bevel ring and side gears and the diff should free up.

Keep in mind that if you hold the diff carrier and spin one of the outdrives it's supposed to bind up some. I'm talking about holding one outdrive and not being able to spin the other.

I dont know why Xray choose to make the bevel ring and side gear two pieces. Maybe they are a different matrerial or something. They have different coatings.

Thank you Zerodefect ... I am having the same problem and I did not know what the prolem was... I will tear it down and see if I can fix it, if it is not too late already.

Don